OK, one last fix -- I removed all XY clipping for VRML and MAYA. The way it
was, if an object was fully outside the screen area, it was being clipped.
But of course this has no meaning in a VRML or MAYA export context. So the
trick right now is to zoom in on the structure, do the rendering, and zoom
out. We could think about making that automatic. Right now you have to do it
yourself.
I'm really glad Ralf brought this up. The VRML is starting to look very
good, I think. I just added caching for fonts and labels. Realize that
labels are an approximation only.
Bob
On Fri, Jul 17, 2009 at 8:29 AM, Robert Hanson <[email protected]> wrote:
> Angel, I've uploaded a pretty succinct VRML exporter. It was simpler than I
> thought -- only requiring one Hashtable for all objects. Not exactly human
> readable anymore, but that's not the point, right? Take a look. We now have
> DEF/USE for appearance, sphere, and cylinder. I also added fillTriangle,
> which instantly adds quite a bit of capability.
>
> Ah, now, the rub. The exporters are of two types. POV-RAY outputs a scene
> in the perspective coordinates of the screen. This is to ensure an identical
> output. VRML/MAYA output regular Cartesian coordinates, without regard to
> perspective. HOWEVER, in order to do that, they have to untransform screen
> points, and that is a possible issue. Basically the "resolution" of the VRML
> output is dependent upon the user's screen resolution. I admit that's a
> design flaw. I notice it with traces, but that's all. So maybe there's a
> simple fix there, and we will have no problem. But it is something I'm
> trying to figure out. This is about all the time I have for this now -- I
> hope I've given you a good head start with it. Thnik about perspective. Jmol
> uses a 4x4 translation/rotation matrix that can be obtained using
> viewer.getUnscaledTransformationMatrix(), which might work for these
> purposes.
>
>
> Bob
>
>
>
> 2009/7/17 Angel Herráez <[email protected]>
>
>> I found some interesting software: Chisel, a VRML optimizer.
>>
>> It's free (PD) and written in Java. One could run any files through
>> it to have them reduced. Of course, if Jmol can do it straight away,
>> it's better.
>> Description of the optimization methods matches what we have been
>> discussing about DEF / USE.
>> I've collated links and brief info into the Jmol Wiki > File formats
>> > 3D Objects > VRML
>>
>> This has also brougth another idea: to gzip the vrml file. Some
>> viewers do not recognize the recommended extension, .vrz, but do read
>> the file if it is gzipped but has wrl extension. Embedding wrz files
>> into web pages seems to work fine.
>> So, Bob, maybe the export dialog could offer a double option?
>> .wrl (plain VRML v2) or .wrz (gzipped VRML v2)
>>
>> I am guessing that Jmol has the gzip algorithm embedded already, does
>> it not?
>>
>> And I think we should change the current default extension of vrml to
>> be wrl which seems to be more widely supported.
>>
>>
>>
>>
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>
>
>
> --
> Robert M. Hanson
> Professor of Chemistry
> St. Olaf College
> 1520 St. Olaf Ave.
> Northfield, MN 55057
> http://www.stolaf.edu/people/hansonr
> phone: 507-786-3107
>
>
> If nature does not answer first what we want,
> it is better to take what answer we get.
>
> -- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
>
--
Robert M. Hanson
Professor of Chemistry
St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
http://www.stolaf.edu/people/hansonr
phone: 507-786-3107
If nature does not answer first what we want,
it is better to take what answer we get.
-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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